LIST [-yes] [<channel>]
Confirms that you want to receive a large amount of data.
If the exact name of a channel is given, the only information about this channel is requested; otherwise, a list of all channels will be displayed.
Displays the channel names that match your request; requesting all channels may cause the server to disconnect you for flooding.
/LIST /LIST -yes /LIST #ubuntu /LIST #*ubuntu*,>1
Not all networks support server-side filtering. Some provide a network service or service bot instead; on IRCnet, you may use the List service:
/SQUERY Alis HELP
Other networks with service bots (like ChanServ) may also provide a list service bot (confirm with /WHOIS ALIS):
/MSG Alis HELP